04-11-2016, 04:10 PM
1464794518-patrasmarandifinelppt.ppt (Size: 4.44 MB / Downloads: 9)
Mineral Soil
Is never saturated with water for more than a few days and contains less than 20 % (by weight) organic carbon
If saturated with water for longer periods or artificially drained and excluding live roots, has an organic-carbon content of:
Less than 18 % if the mineral fraction contains 60% or more clay;
Less than 12 %, if the mineral fraction contains no clays; or
Less than 12 + (clay percentage multiplied by 0.1) %, if the mineral fraction contains less than 60%.
Describing Soil Morphologyfor Mineral Soil
Soil Texture and Coarse Fragment Content
Soil Structure (Type, Size and Grade)
Soil Color
Consistency
Redoximorphic Features
Boundaries
Soil Structure
“Structure is the naturally occurring arrangement of soil particles into aggregates (peds) that result from pedogenic processes.
The grouping or arrangement of individual soil particles into a larger grouping. The soil peds are a cluster or grouping of sand, silt, clay, organic material, biological slimes, and fungal masses.
Three general groups
Natural Soil Structural Units (pedogenic structure)
Structureless
Artificial Earthy Fragments or Clods
Describing Soil Structure
Type – shape of the structure
Size – relative size of the structure
Grade – how well the structure is expressed in place.
Soil Structure
Type
Size
Grade
Soil Structural Types
Granular
Blocky
Angular Blocky
Subangular Blocky
Platy
Wedge
Prismatic
Columnar
Massive
Single Grain